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                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/vm-max-map-count.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/vm-max-map-count.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/vm-max-map-count.html" rel="nofollow" target="_blank">../en/vm-max-map-count.html</a></div>
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<strong>重要</strong>: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html" rel="nofollow">当前版本文档</a>。
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<a id="vm-max-map-count"></a>虚拟内存 (Virtual memory)
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默认情况下，Elasticsearch 使用 <a class="xref" href="index-modules-store.html#mmapfs"><code class="literal">mmapfs</code></a> 目录来存储索引。
操作系统对 mmap 计数的默认的限制可能太低，这可能导致内存不足异常。
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在 Linux 上，可以通过以 <code class="literal">root</code> 用户身份运行以下命令来增加限制：
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<pre class="programlisting prettyprint lang-sh">sysctl -w vm.max_map_count=262144</pre>
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要永久设置此值，请更新 <code class="literal">/etc/sysctl.conf</code> 中的 <code class="literal">vm.max_map_count</code> 设置。
要在重启后进行验证，请运行命令 <code class="literal">sysctl vm.max_map_count</code>。
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RPM和Debian包会自动配置这个设置，不需要进一步的配置。
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